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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2015
Segment Reporting [Abstract]  
Analysis and reconciliation of reportable segment information
An analysis and reconciliation of the Registrants’ reportable segment information to the respective information in the consolidated financial statements for the years ended December 31, 2015, 2014, and 2013 is as follows:


Generation (a)

ComEd

PECO

BGE

Other (b)

Intersegment
Eliminations

Exelon
Operating revenues(c):
2015
 
 
 
 
 
 
 
 
 
 
 
 
 
Competitive businesses electric revenues
$
15,944

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(744
)
 
$
15,200

Competitive businesses natural gas revenues
2,433

 
—

 
—

 
—

 
—

 
—

 
2,433

Competitive businesses other revenues
758

 
—

 
—

 
—

 
—

 
(1
)
 
757

Rate-regulated electric revenues
—

 
4,905

 
2,486

 
2,490

 
—

 
(5
)
 
9,876

Rate-regulated natural gas revenues
—

 
—

 
546

 
645

 
—

 
(15
)
 
1,176

Shared service and other revenues
—

 
—

 
—

 
—

 
1,372

 
(1,367
)
 
5

2014
 
Competitive businesses electric revenues
$
14,533

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(760
)
 
$
13,773


Generation (a)

ComEd

PECO

BGE

Other (b)

Intersegment
Eliminations

Exelon
Competitive businesses natural gas revenues
2,705

 
—

 
—

 
—

 
—

 
(1
)
 
2,704

Competitive businesses other revenues
155

 
—

 
—

 
—

 
—

 
(1
)
 
154

Rate-regulated electric revenues
—

 
4,564

 
2,448

 
2,460

 
—

 
(5
)
 
9,467

Rate-regulated natural gas revenues
—

 
—

 
646

 
705

 
—

 
(26
)
 
1,325

Shared service and other revenues
—

 
—

 
—

 
—

 
1,285

 
(1,279
)
 
6

2013
 
Competitive businesses electric revenues
$
13,862

 
$
—

 
$
—

 
$
—

 
$
—

 
$
(1,366
)
 
$
12,496

Competitive businesses natural gas revenues
1,721

 
—

 
—

 
—

 
—

 
—

 
1,721

Competitive businesses other revenues
47

 
—

 
—

 
—

 
—

 
(1
)
 
46

Rate-regulated electric revenues
—

 
4,464

 
2,500

 
2,405

 
—

 
(4
)
 
9,365

Rate-regulated natural gas revenues
—

 
—

 
600

 
660

 
—

 
(14
)
 
1,246

Shared service and other revenues
—

 
—

 
—

 
—

 
1,241

 
(1,227
)
 
14

Intersegment revenues(d):
2015
$
745

 
$
4

 
$
2

 
$
14

 
$
1,367

 
$
(2,127
)
 
$
5

2014
762

 
4

 
2

 
25

 
1,280

 
(2,067
)
 
6

2013
1,367

 
3

 
1

 
13

 
1,237

 
(2,607
)
 
14

Depreciation and amortization
2015
$
1,054

 
$
707

 
$
260

 
$
366

 
$
63

 
$
—

 
$
2,450

2014
967

 
687

 
236

 
371

 
53

 
—

 
2,314

2013
856

 
669

 
228

 
348

 
52

 
—

 
2,153

Operating expenses (c):
2015
$
16,872

 
$
3,889

 
$
2,404

 
$
2,578

 
$
1,444

 
$
(2,131
)
 
$
25,056

2014
16,923

 
3,586

 
2,522

 
2,726

 
1,353

 
(2,071
)
 
25,039

2013
13,976

 
3,510

 
2,434

 
2,616

 
1,324

 
(2,618
)
 
21,242

Equity in earnings (losses) of
unconsolidated affiliates
2015
$
(8
)
 
$
—

 
$
—

 
$
—

 
$
1

 
$
—

 
$
(7
)
2014
(20
)
 
—

 
—

 
—

 
—

 
—

 
(20
)
2013
10

 
—

 
—

 
—

 
—

 
—

 
10

Interest expense, net:
2015
$
365

 
$
332

 
$
114

 
$
99

 
$
123

 
$
—

 
$
1,033

2014
356

 
321

 
113

 
106

 
169

 
—

 
1,065

2013
357

 
579

 
115

 
122

 
183

 
—

 
1,356

Income (loss) before income
taxes:
2015
$
1,850

 
$
706

 
$
521

 
$
477

 
$
(219
)
 
$
(5
)
 
$
3,330

2014
1,226

 
676

 
466

 
351

 
(227
)
 
(6
)
 
2,486

2013
1,675

 
401

 
557

 
344

 
(191
)
 
(13
)
 
2,773

Income taxes:
2015
$
502

 
$
280

 
$
143

 
$
189

 
$
(41
)
 
$
—

 
$
1,073


Generation (a)

ComEd

PECO

BGE

Other (b)

Intersegment
Eliminations

Exelon
2014
207

 
268

 
114

 
140

 
(63
)
 
—

 
666

2013
615

 
152

 
162

 
134

 
(20
)
 
1

 
1,044

Net income (loss):
2015
$
1,340

 
$
426

 
$
378

 
$
288

 
$
(177
)
 
$
(5
)
 
$
2,250

2014
1,019

 
408

 
352

 
211

 
(164
)
 
(6
)
 
1,820

2013
1,060

 
249

 
395

 
210

 
(171
)
 
(14
)
 
1,729

Capital expenditures:
2015
$
3,841

 
$
2,398

 
$
601

 
$
719

 
$
65

 
$
—

 
7,624

2014
3,012

 
1,689

 
661

 
620

 
95

 
—

 
6,077

2013
2,752

 
1,433

 
537

 
587

 
86

 
—

 
5,395

Total assets:
2015
$
46,529

 
$
26,532

 
$
10,367

 
$
8,295

 
$
15,389

 
$
(11,728
)
 
$
95,384

2014
44,951

 
25,358

 
9,860

 
8,056

 
9,711

 
(11,520
)
 
86,416

__________________________
(a)
Generation includes the six power marketing reportable segments shown below: Mid-Atlantic, Midwest, New England, New York, ERCOT and Other Power Regions. For the year ended December 31, 2015, intersegment revenues for Generation include revenue from sales to PECO of $224 million and sales to BGE of $502 million in the Mid-Atlantic region, and sales to ComEd of $18 million in the Midwest region, which eliminate upon consolidation. For the year ended December 31, 2014, intersegment revenues for Generation include revenue from sales to PECO of $198 million and sales to BGE of $387 million in the Mid-Atlantic region, and sales to ComEd of $176 million in the Midwest region, which eliminate upon consolidation. For the year ended December 31, 2013, intersegment revenues for Generation include revenue from sales to PECO of $405 million and sales to BGE of $455 million in the Mid-Atlantic region, and sales to ComEd of $506 million in the Midwest region, net of $7 million related to the unrealized mark-to-market losses related to the ComEd swap, which eliminate upon consolidation.
(b)
Other primarily includes Exelon’s corporate operations, shared service entities and other financing and investment activities.
(c)
For the years ended December 31, 2015, 2014 and 2013, utility taxes of $105 million, $89 million and $79 million, respectively, are included in revenues and expenses for Generation. For the years ended December 31, 2015, 2014 and 2013, utility taxes of $236 million, $238 million and $241 million, respectively, are included in revenues and expenses for ComEd. For the years ended December 31, 2015, 2014 and 2013, utility taxes of $133 million, $128 million and $129 million, respectively, are included in revenues and expenses for PECO. For the years ended December 31, 2015, 2014 and 2013, utility taxes of $85 million, $86 million and $82 million are included in revenues and expenses for BGE, respectively.
(d)
Intersegment revenues exclude sales to unconsolidated affiliates. The intersegment profit associated with Generation’s sale of certain products and services by and between Exelon’s segments is not eliminated in consolidation due to the recognition of intersegment profit in accordance with regulatory accounting guidance. For Exelon, these amounts are included in operating revenues in the Consolidated Statements of Operations and Comprehensive Income.
Analysis and reconciliation of reportable segment revenues for Generation
 
 
2015
 
2014
 
2013
 
Revenues
from
external
customers(b)
 
Intersegment
revenues
 
Total
revenues
 
Revenues
from
external
customers(b)(d)
 
Intersegment
revenues(d)
 
Total
revenues
 
Revenues
from
external
customers(b)(d)
 
Intersegment
revenues(d)
 
Total
revenues
Mid-Atlantic(a)
$
5,974


$
(74
)
 
$
5,900

 
$
5,414


$
(155
)

$
5,259

 
$
5,261


$
(57
)
 
$
5,204

Midwest
4,712


(2
)
 
4,710

 
4,488


(13
)

4,475

 
4,298


(28
)
 
4,270

New England
2,217


(5
)
 
2,212

 
1,468


(46
)

1,422

 
1,279


(42
)
 
1,237

New York
996


(11
)
 
985

 
846


(3
)

843

 
717


(3
)
 
714

ERCOT
863


(6
)
 
857

 
938


(3
)

935

 
1,223


(7
)
 
1,216

Other Power Regions 
1,182


(80
)
 
1,102

 
1,379


(70
)

1,309

 
1,084


(116
)
 
968

Total Revenues
for Reportable Segments
$
15,944


$
(178
)
 
$
15,766

 
$
14,533


$
(290
)

$
14,243

 
$
13,862


$
(253
)
 
$
13,609

Other (c)
3,191


178

 
3,369

 
2,860


290


3,150

 
1,768


253

 
2,021

Total
Generation Consolidated Operating Revenues
$
19,135


$
—

 
$
19,135

 
$
17,393


$
—


$
17,393

 
$
15,630


$
—

 
$
15,630

_______________________ 
(a)
On April 1, 2014, Generation assumed operational control of CENG's nuclear fleet. As a result, beginning on April 1, 2014, CENG's revenues are included on a fully consolidated basis.
(b)
Includes all wholesale and retail electric sales to third parties and affiliated sales to ComEd, PECO and BGE.
(c)
Other represents activities not allocated to a region. See text above for a description of included activities. Also includes a $7 million increase to revenues, a $289 million decrease to revenues, and a $767 million decrease to revenues for the amortization of intangible assets related to commodity contracts recorded at fair value for the years ended December 31, 2015, 2014, and 2013, respectively, unrealized mark-to-market gains of $203 million, losses of $174 million, and gains of $220 million for the years ended December 31, 2015, 2014, and 2013, respectively, and elimination of intersegment revenues.
(d)
Exelon corrected an error in the December 31, 2014 and December 31, 2013 balances within Intersegment revenues and Revenues from external customers for an overstatement of Intersegment revenues for Reportable Segments of $284 million and $252 million for the years ended December 31, 2014 and 2013, respectively, an understatement of Revenues from external customers for Reportable Segments of $284 million and $252 million for the years ended December 31, 2014 and 2013, respectively, an understatement of Intersegment revenues for Other of $284 million and $252 million for the years ended December 31, 2014 and 2013, respectively, and an overstatement of Revenues from external customers for Other of $284 million and $252 million for the years ended December 31, 2014 and 2013, respectively. The error is not considered material to any prior period, and there is no net impact to Total Revenues.
Reconciliation of revenues from segments to consolidated
Generation total revenues net of purchased power and fuel expense:
 
 
2015
 
2014
 
2013
 
RNF from
external
customers(b)
 
Intersegment
RNF
 
Total
RNF
 
RNF from
external
customers(b)(d)
 
Intersegment
RNF d)
 
Total
RNF
 
RNF from
external
customers(b)(d)
 
Intersegment
RNF(d)
 
Total
RNF
Mid-Atlantic(a)
$
3,556


$
15

 
$
3,571

 
$
3,544


$
(113
)
 
$
3,431

 
$
3,287


$
(17
)
 
$
3,270

Midwest
2,912


(20
)
 
2,892

 
2,607


(8
)
 
2,599

 
2,606


(20
)
 
2,586

New England
519


(58
)
 
461

 
450


(99
)
 
351

 
299


(114
)
 
185

New York
584


50

 
634

 
439


44

 
483

 
(55
)

51

 
(4
)
ERCOT
425


(132
)
 
293

 
573


(256
)
 
317

 
627


(191
)
 
436

Other Power Regions 
440


(190
)
 
250

 
517


(190
)
 
327

 
397


(196
)
 
201

Total Revenues net of
purchased power and fuel expense for Reportable Segments
$
8,436


$
(335
)
 
$
8,101

 
$
8,130


$
(622
)
 
$
7,508

 
$
7,161


$
(487
)
 
$
6,674

Other (c)
678


335

 
1,013

 
(662
)

622

 
(40
)
 
272


487

 
759

Total Generation
Revenues net of purchased power and fuel expense
$
9,114


$
—

 
$
9,114

 
$
7,468


$
—

 
$
7,468

 
$
7,433


$
—

 
$
7,433

____________________________ 
(a)
On April 1, 2014, Generation assumed operational control of CENG's nuclear fleet. As a result, beginning on April 1, 2014, CENG's revenue net of purchased power and fuel expense are included on a fully consolidated basis.
(b)
Includes purchases and sales from third parties and affiliated sales to ComEd, PECO and BGE.
(c)
Other represents activities not allocated to a region. See text above for a description of included activities. Also includes a $8 million increase in RNF, a $124 million decrease in RNF, and a $488 million decrease in RNF for the amortization of intangible assets related to commodity contracts recorded at fair value for the years ended December 31, 2015, 2014, and 2013, respectively, unrealized mark-to-market gains of $257 million, losses of $591 million, and gains of $504 million for the years ended December 31, 2015, 2014, and 2013, respectively, and the elimination of intersegment revenue net of purchased power and fuel expense.
(d)
Exelon corrected an error in the December 31, 2014 and December 31, 2013 balances within Intersegment RNF and RNF from external customers for an understatement of $8 million and an overstatement of $134 million of Intersegment RNF for Reportable Segments for the years ended December 31, 2014 and 2013, respectively, an understatement of RNF from external customers for Reportable Segments of $11 million and $134 million for the years ended December 31, 2014 and 2013, respectively, an overstatement of $8 million and an understatement $134 million of Intersegment RNF for Other for the years ended December 31, 2014 and 2013, respectively, and an overstatement of RNF from external customers for Other of $11 million and $134 million for the years ended December 31, 2014 and 2013, respectively. This also included an understatement of total RNF for Reportable Segments and an overstatement of total RNF for Other of $19 million for the year ended December 31, 2014. The error is not considered material to any prior period, and there is no net impact to Generation Total RNF for 2013 or 2014.